我需要将 Entity Framework 数据上下文公开给第三方插件。目的是允许这些插件仅获取数据,而不允许它们发出插入,更新或删除或任何其他数据库修改命令。因此,如何使数据上下文或实体变为只读。
最佳答案
除了与只读用户建立连接外,您还可以对DbContext执行其他一些操作。
public class MyReadOnlyContext : DbContext
{
// Use ReadOnlyConnectionString from App/Web.config
public MyContext()
: base("Name=ReadOnlyConnectionString")
{
}
// Don't expose Add(), Remove(), etc.
public DbQuery<Customer> Customers
{
get
{
// Don't track changes to query results
return Set<Customer>().AsNoTracking();
}
}
public override int SaveChanges()
{
// Throw if they try to call this
throw new InvalidOperationException("This context is read-only.");
}
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
// Need this since there is no DbSet<Customer> property
modelBuilder.Entity<Customer>();
}
}